WooHoo! I may have found a solution to this. I had my Bold in my pocket last night and this morning the trackball stopped clicking. It worked fine for a few hours and then nothing. I had to hit "enter" to get anything to select. I was about to resign myself to calling for a warranty exchange. Instead, I blew some compressed air in the trackball while flicking it and clicking it rapidly. It works perfectly now. It may have been lint or some other debris.